itch.io

If you go back to some older editions of D&D, especially BECMI; you'll find a "standardised" key/legend of dungeon features that hasn't changed much & should be familiar to "old school gamers".  The developer seems to be using a lot of those standard symbols. The "circled star" is a classic. I love it!

If you right-click & choose "Notes Mode" from the drop-down menu, you can change the map so it only displays room numbers

If you "right click" & choose "save as PNG" from the drop-down menu.   That saves it as a PNG (picture file) in your Downloads folder. In that same drop-down menu you can click on "Notes Mode". This gives you a sub-menu that allows you to change the map so it only displays "Room Numbers". You can then "Save as PNG" & upload or email it to your players, giving them a map they can use but keeping the contents of the rooms a surprise to your players. You should also be able to edit the PNG in whatever picture editing tools you have on your computer, ie. MS Paint, PhotoShop etc. FYI: Once you right-click to get the drop-down menu, you may have to "scroll down" the page to see all the options in that drop-down menu, as the drop-down menu can be quite long. I hope this helps :-)